While this new movie is not MOS2, I do think that this movie will reduce the chances our getting a MOS2.
It will be big and will lead us to Justice League.
We will likely get a Batman movie between the two films.
My fear is Superman will end up as just a team player a la Hulk and be unable to get another solo movie for a long time.

No. Snyder said in the Bat was just one single element to the story and brought out the passage as to how and why his introduction could make sense. I think this will be more directed towards the Clark Kent/Bruce Wayne/ Luthor dynamic than it would be with the Superman/Batman relationship. I think they will throw down at the end of the movie with quick turnaround, but Superman's world will be more fleshed out than Batman's story so I don't think he will drag it down. I think Bruce will be written into the story alongside Lex as the villain and eventually, join forces with Supes after their showdown once Lex is exposed.

Entirely possible if they go the Bruce Timm route of making Batman the protagonist in every encounter he has with Superman. Best Superman ever does is achieve co-protagonist status but Batman never takes a backseat to Superman in those cartoons. Why should we think the movies would be any different?

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"Spider-man is the Charlie Brown of the Marvel Universe." ~ Kevin Smith

No. Snyder said in the Bat was just one single element to the story and brought out the passage as to how and why his introduction could make sense. I think this will be more directed towards the Clark Kent/Bruce Wayne/ Luthor dynamic than it would be with the Superman/Batman relationship. I think they will throw down at the end of the movie with quick turnaround, but Superman's world will be more fleshed out than Batman's story so I don't think he will drag it down. I think Bruce will be written into the story alongside Lex as the villain and eventually, join forces with Supes after their showdown once Lex is exposed.

In that case, that's a great idea! By "teasing" Batman near the end of the film, it can set up World's Finest while being a strong self-contained narrative.

No. Snyder said in the Bat was just one single element to the story and brought out the passage as to how and why his introduction could make sense. I think this will be more directed towards the Clark Kent/Bruce Wayne/ Luthor dynamic than it would be with the Superman/Batman relationship. I think they will throw down at the end of the movie with quick turnaround, but Superman's world will be more fleshed out than Batman's story so I don't think he will drag it down. I think Bruce will be written into the story alongside Lex as the villain and eventually, join forces with Supes after their showdown once Lex is exposed.

I'm not saying I don't believe you, but it'd be great to have some links and interviews so we can read all those things ourselves. If you have a link for when Snyder said this please share it.

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Snyder made a surprise appearance at at the Con in order to reveal the news.

"I know there is some speculation about what we are doing and it is official that we are going to make another Superman movie," he told the Hall H crowd. "And so you know what happens next. [People will ask] 'Well Zack, what's the next movie about?' And the truth is you don't want to know, right? It's a movie. But, I can say there is a single element that's in the film, that I could help you out with."

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No. Snyder said in the Bat was just one single element to the story and brought out the passage as to how and why his introduction could make sense. I think this will be more directed towards the Clark Kent/Bruce Wayne/ Luthor dynamic than it would be with the Superman/Batman relationship. I think they will throw down at the end of the movie with quick turnaround, but Superman's world will be more fleshed out than Batman's story so I don't think he will drag it down. I think Bruce will be written into the story alongside Lex as the villain and eventually, join forces with Supes after their showdown once Lex is exposed.

I do hope Superman's story will be fleshed out more and Batman's just there to get the butts in seats.

Im actually more worried about Superman hampering our first look at the new Batman. As long as we get a fleshed out Batman, which means good, solid looks at the Wayne Manor, Batcave, Alfred, and a decent amount of Commissioner Gordon etc I think we'll be fine.

For sure this film will be 2.5 hours. With most of Superman's origin out of the way and treating Batman as a character the audience already knows for the most part, it will be fine.

Snyder made a surprise appearance at at the Con in order to reveal the news.

"I know there is some speculation about what we are doing and it is official that we are going to make another Superman movie," he told the Hall H crowd. "And so you know what happens next. [People will ask] 'Well Zack, what's the next movie about?' And the truth is you don't want to know, right? It's a movie. But, I can say there is a single element that's in the film, that I could help you out with."

I have no idea how people are misinterpreting what he actually said.
As to the question, IDK;'Snyder seems to love and respect Superman but Goyer wrote Batman. I guess people are worried this will be like Superman/Batman in the 90's. the only thing I really remember from those encounters was they had to make Batman smarter and tone down Superman's intelligence.